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Linear Weld Group Analysis

Linear Weld Group Analysis

Linear Weld Group Analysis

(OP)
Having a discussion in our office about the use of equation J2-4 in AISC 360-05. Specifically we are discussing when it is appropriate to use the 50% increase in nominal weld strength (Eqn J2-5).

I had always interpreted that equation the following way:

Say you have an angle welded on three sides to the stem of a WT (Case A in the attachment). The angle and WT are normal to each other and the angle supports an axial load. My interpretation has always been you get a 50% increase of the weld with it's axis that is perpendicular to the load and no increase to the weld with it's axis parallel to the load.

The question came up when analyzing an HSS with a fixed connection to a baseplate (Case B in the attachment). In this case the HSS has a moment and shear force and the weld is analyzed using the elastic method in chapter 8. The moment is much much greater than shear. I don't believe this qualifies for the 50% increase because this welded isn't loaded in-plane.

Thoughts?

RE: Linear Weld Group Analysis

The in-plane loading restriction has been removed in AISC 360-10 so, from a mechanics standpoint, you can take advantage of the strength increase for Case B but it doesn't technically satisfy the requirements of AISC 360-05 J2.4. The Commentary to Chapter J of AISC 360-10 indicates that "testing by Gomez et al. (2008) indicated that the strength increase defined in Equation J2.5 does not have to restricted to loads in-plane".

Personally I would take advantage of the strength increase.

RE: Linear Weld Group Analysis

(OP)
Thanks Hokie. I guess sometimes it pays to look at the new code! I'm a creature of habit and like to use 360-05 because I'm familiar with it.

I agree. I think we can apply the 50% increase per 360-10.

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